Manufacture of abrasive material.



No. 888,129. PATENTED MAY 19, 1908. P. J. TONE. MANUFACTURE OF ABRASIVB MATERIAL.

APPLICATION FILED APR. 26.1905.

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FRANK J. TONE, OF NIAGARA FALLS, NEW YORK, ASSIGNOR TO THE OARBORUNDUM COM- PANY, OF NIAGARA FALLS, NEW YORK, A CORPORATION OF PENNSYLVANIA.

MANUFACTURE OF ABRASIVE MATERIAL.

Niagara Falls, Niagara county, New York, have invented a new and useful Improvement in the Manufacture of Abrasive Material, of which the following is a full, clear,

, and exact description, reference being had to rial. surface is said to be"glaze slides over it without being cut.

the accompanying drawings, forming part of this specification, in which Figure 1 is a plan view of a grinding disk embodying my invention; Fig. 2 shows a modified construction; and Figs. 3 and 4 are res ectively a plan view and edge view of a dis embodying my invention and having a peri heral grinding surface.

T 's invention 'relates especially to the manufacture of abrasive material in which abrasive grains, such as emery or carborundum are coated on paper and cloth. This material is used in a variety of ways and for many urposes. An important use is that in whic it is mounted on a roll, drum or disk with the grain side exposed, and is revolved at high speed, the material to be ground or polished being brou ht to bear upon it. Abrasive paper and 0 0th used in this manner may become worn out and cease to do a proper amount of work, either because the grams have worn from the backing or because the spaces between the rains have become filled u with particles 0 the ground matehen this latter hap ens, the cutting and the work M invention relates to a method of preventing such glazing of the aper and cloth, and increasing its life and e ciency. It consists in removing the abrasive material at certain portions of the backing and thus constituting clearance spaces so that the particles of material ground ma be freed from the working cutting face. an be thrown out of the way. 1

Referri to the drawing, Figure 1 represents a dis of emery cloth such as is commonlynused ,on the grinding machine of the own-as the disk surface grinder. This consists of a cloth backing which has been coated with eme grains held in lace by means of glue, an having radial'c earance channels 2, 2 formed by removing the grains alo lines regularly spaced around the disk. en the material to be round is brought to bear against the revolving disk, the particles ground ofi are carried along the Specification of Letters Patent. Application filed April 25,1905. Serial No. 267,318.

. Patented May 19, 1908.

cutting surface until they reach a groove when they are free to drop out or are carried away by centrifugal force. They are thus prevented from bedding themselves among the grains and formin a filled-up glazed surface of low cutting efiiciency.

Fig. 2 shows a disk in which the clearance channels 2 take a curved or involute form.

In disks formed according to my invention, the cloth or paper is made in long lengths in a continuous machine in the manner well known to those skilled in the art of making sand aper. The coating of grains is uniform and even in thickness. After the cloth or paper is made and cut into disk-form and before mounting it on the face-plate of the grinder I cut'the clearance channels by means of an abrasive wheel or other device so adjusted that it cuts through the coating of grains but does not cut the cloth backing underneath. The channels thus made are more regular than can be made by any method heretofore used, and present better cutting edges. In a similar manner I may prepare paper and cloth for use on buffing rolls and on polishing wheels. In all of these cases the cutting efficiency and durability of the material are greatly increased.

Fi s. 3'a nd 4 show a buffing wheel in which the airasive cloth offers a cutting face on the periphery .of the wheel. Before mounting the strip of cloth on the wheel I provide the strip with diagonal grooves or channels 2 in the manner above described, by removing the abrasive ains along the lines desired for these channe s. When so formed the cutting eificiency and life of the coating is much greater than that of a wheel having a uniform coating of grains without channels.

My invention may be modified in various ways by those skilled in the art. It may be applied to the manufacture of abrasive belts In testimony whereof, I have hereunto set my hand.

. FRANK J. TONE. Witnesses;

ASHMEAD G. RODGERS, FRANK L. BUELL. 

